An interesting idea, though I think this could be fleshed out into pretty sweet game. I think that one huge point that would make gameplay less clunky would be to change the "Only move forward or stand still" aspect, Only being able to move towards the mouse makes it more difficult to maneuver to avoid enemies, and not in a "fun challenge" sort of a way, but more like an unnecessary difficulty. I think this game would be more playable with WASD/arrow key movement. Also, I'm a sucker for upgrade games, so rather than just collecting cogs, and your rockets getting stronger or whatever and seemingly random intervals, maybe have a countdown towards your next upgrade, or make it so that the cogs can be used to purchase upgrades in a separate menu. This game has the potential to be getting more stars from me in the future, so I'll keep an eye out for 2.0!